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An enigmatic humanoid discovers The TARDIS situated on an unknown landscape and knocks on the door, identifying himself to the Doctor only as "I'm bad". The Doctor is uninterested however, until the alien speaks to him with a deep voice, and pronouncing his name as "Doc-tor". Wishing for the Doctor to stop him but lacking an actual plan, only an idea to " hollow out the Earth's core, and replace it with a giant motor, so I can pilot the planet anywhere in the universe", the Doctor replies that it "has been done", and so he agrees to come back tomorrow.

This time holding hands with another humanoid, he returns and knocks on the TARDIS door again, the Doctor again answers, telling someone inside the TARDIS that "it's for me." The humanoid's new plan is to "drain the world's oceans into the earth's white hot molten core, and boil them away". The Doctor says that this has also been attempted, but reluctantly agrees to stop them, much to their excitement. They then arrange to do this on "Wednesday, all day".

The two walk off as the TARDIS dematerialises, only to return mere seconds later. The Doctor unknowingly asks "where have you brought me to this time old girl", before spotting the two aliens attracting his attention. They both agree that "he's nice, isn't he", before walking off again.